Science Archives Publication System

Deuterated Interstellar Polycyclic Aromatic Hydrocarbons

DOI: 10.1086/381866 Bibcode: 2004ApJ...604..252P

Tielens, A. G. G. M.; Allamandola, L. J.; Peeters, E. +3 more

We report infrared spectral evidence of deuterated interstellar polycyclic aromatic hydrocarbons (PAHs). Two bands are detected in the infrared emission from the ionization bar in Orion at 4.4 and 4.65 µm. The one at 4.65 µm is present at the 4.4 σ level, while the one at 4.4 µm is more tentative, with a σ equal to 1.9. An emissi…

2004 • The Astrophysical Journal

ISO 86

First determination of the dynamical mass of a binary L dwarf

DOI: 10.1051/0004-6361:20040551 Bibcode: 2004A&A...423..341B

Duchêne, G.; Martín, E. L.; Bouy, H. +11 more

We present here the results of astrometric, photometric and spectroscopic observations leading to the determination of the orbit and dynamical masses of the binary L dwarf 2MASSW J0746425+2000321. High angular resolution observations spread over almost 4 years and obtained with the Hubble Space Telescope (HST), the ESO Very Large Telescope (VLT), …

2004 • Astronomy and Astrophysics

eHST 86

A Very Low Luminosity X-Ray Flash: XMM-Newton Observations of GRB 031203

DOI: 10.1086/420844 Bibcode: 2004ApJ...605L.101W

Watson, D.; O'Brien, P. T.; Reeves, J. N. +9 more

GRB 031203 was observed by XMM-Newton twice, first with an observation beginning 6 hr after the burst and again after 3 days. The afterglow had average 0.2-10.0 keV fluxes for the first and second observations of (4.2+/-0.1)×10^-13 and (1.8+/-0.1)×10^-13 ergs cm^-2 s^-1, respectively, decaying very slowly ac…

2004 • The Astrophysical Journal

XMM-Newton 86

Chandra Observations of the X-Ray Environs of SN 1998bw/GRB 980425

DOI: 10.1086/420878 Bibcode: 2004ApJ...608..872K

Pian, E.; Kouveliotou, C.; Wijers, R. A. M. J. +8 more

We report X-ray studies of the environs of SN 1998bw and GRB 980425 using the Chandra X-Ray Observatory 1281 days after the gamma-ray burst (GRB). Eight X-ray point sources were localized, three and five each in the original error boxes, S1 and S2, assigned for variable X-ray counterparts to the GRB by BeppoSAX. The sum of the discrete X-ray sourc…

2004 • The Astrophysical Journal

XMM-Newton 86

A possible age-metallicity relation in the Galactic thick disk?

DOI: 10.1051/0004-6361:20035957 Bibcode: 2004A&A...421..969B

Feltzing, S.; Bensby, T.; Lundström, I.

A sample of 229 nearby thick disk stars has been used to investigate the existence of an age-metallicity relation (AMR) in the Galactic thick disk. The results indicate that that there is indeed an age-metallicity relation present in the thick disk. By dividing the stellar sample into sub-groups, separated by 0.1 dex in metallicity, we show that t…

2004 • Astronomy and Astrophysics

Hipparcos 86

New Hipparcos-based Parallaxes for 424 Faint Stars

DOI: 10.1086/381147 Bibcode: 2004ApJS..150..455G

Gould, Andrew; Chanamé, Julio

We present a catalog of 424 common proper-motion companions to Hipparcos stars with good (>3 σ) parallaxes, thereby effectively providing new parallaxes for these companions. Compared with typical stars in the Hipparcos catalog, these stars are substantially dimmer. The catalog includes 20 white dwarfs and an additional 29 stars with M_V

2004 • The Astrophysical Journal Supplement Series

Hipparcos 86

The Chemical Properties of Milky Way and M31 Globular Clusters. I. A Comparative Study

DOI: 10.1086/424000 Bibcode: 2004AJ....128.1623B

Forbes, Duncan A.; Brodie, Jean P.; Beasley, Michael A. +4 more

A comparative analysis is performed between high-quality integrated spectral indices of 30 M31 globular clusters, 20 Milky Way globular clusters, and a sample of field and cluster elliptical galaxies. We find that the Lick CN indices in the M31 and Galactic clusters are enhanced relative to the bulges of the Milky Way, M31, and elliptical spheroid…

2004 • The Astronomical Journal

eHST 86

Measurement and Uncertainty of the Long-Term Total Solar Irradiance Trend

DOI: 10.1007/s11207-005-5698-7 Bibcode: 2004SoPh..224..209D

Mekaoui, Sabri; Dewitte, Steven; Crommelynck, Dominique +1 more

A possible long-term trend of the total solar irradiance could be a natural cause for climate variations on Earth. Measurement of the total solar irradiance with space radiometers started in 1978. We present a new total solar irradiance composite, with an uncertainty of ± 0.35 W m⁻². From the minimum in 1995 to the maximum in 2002 the t…

2004 • Solar Physics

SOHO 85

On the Constancy of the Solar Diameter. II.

DOI: 10.1086/423301 Bibcode: 2004ApJ...613.1241K

Scherrer, P. H.; Kuhn, J. R.; Bush, R. I. +1 more

The Michelson Doppler Imager instrument on board SOHO has operated for most of a solar cycle. Here we present a careful analysis of solar astrometric data obtained with it from above the Earth's turbulent atmosphere. These data yield the most accurate direct constraint on possible solar radius variations on timescales from minutes to years and the…

2004 • The Astrophysical Journal

SOHO 85

Coronal transients and metric type II radio bursts. I. Effects of geometry

DOI: 10.1051/0004-6361:20031510 Bibcode: 2004A&A...413..363M

Raymond, J. C.; Mancuso, S.

In this paper we investigate the relationship between type II and coronal transient activity in terms of emission originating from the top or the flanks of a bow/piston shock surface, extending just above the coronal mass ejection (CME) leading edge surface. For this purpose, we used ground-based metric type II radio burst observations of twenty-n…

2004 • Astronomy and Astrophysics

SOHO 85